Trimming-cutter.



J. M. MERROW.

TRIMMING CUTTER. APPLIOATION FILED DE9.9,1905.

907,617. Patented Dec. 22,1908.

v iq/yzN-ruk v I v m/l/vmr UNITED STATES PATENT OFFICE.

JOSEPH M. MERROW,

COMPANY, or

OF HARTFORD, CONNECTICUT, ASSIGNOR TO THE MERROW MACHINE HARTFORD, CONNECTICUT, A CORPORATION OF CONNECTICUT.

TRIMMING-CUTTER.

Specification of Letters Patent.

Patented Dec. 22, 1908.

To all whom it may concern:

Be it known that I, J OSEPH M. MERRow, a citizen of the United States, residing in the city and county of Hartford, State of Connecticut, have invented certain new and useful Improvements in Trimming-Cutters, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part of this specification, and to the figures and letters of reference marked thereon.

The principal object of this invention is the production of a knife or cutter, which can be ground or sharpened at both ends to permit of its being reversed in its carrier or older, each end having a guard or guide for its cutting edge, adapted to cooperate with a companion cutter. The cutter shown is especially adapted for use in sewing machines to trim the edge of the material.

The invention consists in certain novel details of construction and combinations and arrangements of parts all of which will be now described and pointed out particularly in the appended claims.

In the accompanying drawings-Figure 1 is a side elevation of the cutter, showing also a portion of the carrier in which it is clamped and of the companion cutter with which it cooperates. Fig. 2 is a front elevation of the parts shown in Fig. 1. Fig. 3 is a front elevation of the cutter, removed from its carrier. Fig. 4 is a side elevation of the cutter as viewed from the left of Fig. 8. Fig. 5 is a plan view of the cutteras viewed from above in the position shown in Fig. 3. Fig. 6 is a cross sectional view on the line 6-6 of Fig. 3. Fig. 7 is a view of the cutter, clamped in a modified form of carrier. Fig. 8 is a sectional view taken on the line 8-8 of Fig. 7.

Similar letters and numerals of reference in the several figures indicate like parts.

The cutter A is preferably made from bar steel and with two wings or flanges a I), both thinner at their edges than at their junction with each other, the outside faces of the said flanges being at or nearly at a right angle to each other and the inside faces of said flanges being at an obtuse angle to each other, as shown clearly in Fig. 6. The two flanges are preferably made alike in cross section in order that the cutting edges (a and b at the ends) when the cutter is reversed, may have the same angle in relation to the cutting end of the companion cutter B. Both ends of the cutter A are ground each end in a single plane entirely across both flanges, thus at each end one flange forms a guide and the other a cutter and as shown, the flange which forms the guide at one end constitutes the cutter at the opposite end and the flange forming the cutter at one end constitutes the guide at the opposite end. The end faces of the cutter are preferably bevel faces or are inclinded both with respect to the major axis of the cutter and with respect to each other as the cutter in use is preferably mounted in an inclined position in its carrier with the operative end face vertical or in substantially the same or parallel with the plane of the side face of the companion cutter as shown in Fig. 2.

When the cutter is reversed in its carrier or holder, it is turned end for end, rotated a quarter turn upon its major axis so that the flange which before rested against the face of the carrier 0 will project outward and the flange that before projected outward will now rest against the face of the carrier. In this position the flange which before furnished the guide will now furnish the cutting edge (at its opposite end) and the flange which before furnished the cutting edge will now furnish the guide.

The cutter resulting from the preferred construction described, it will be seen, has the face at one end formed in a plane bearing a certain relation to one of the flanges while the face at the opposite end bears the same relation to the other flange. As the cutter wears or becomes dull, the entire end faces are ground each in its own single plane, and care should be exercised to maintain the planes parallel with the plane of movement of the cutter when set either end around and turned to present the guide and cutter for proper operation. To set the cutter and retain it in its carrier or holder and enable it to be easily and correctly adjusted laterally of its ath of movement, the outside face of each lange is provided with guiding means shown in the drawings as guideways a 6 at a right angle or erpendicular to the face of the cutting end? When the face of the flange is placed upon the carrier or holder 0, the guideway fits a tongue or guide 0, the cooperating guides serving to direct the cutter in its lateral adjustment. The cutter is held by a clamp D preferably provided with a tongue 01' loosely fitted in the groove c of the carrier or holder C and the hole d for the screw C is elongated to permit the clamp D to move laterally when adjusting the cutter A.

Figs. 7 and 8 illustrate a modified form of holder E in which the cutter A may be used and in which a guiding groove 6 is substituted for the tongue 0 in the holder or carrier C. The groove 6 in the carrier or holder E is made to fit the cutter A so that the latter may be adjusted in a diagonal direction. The cutter carrier or holder is ordinarily intended to be moved up and down (as represented by the arrows) a suitable distance in a path substantially parallel to the plane of the face I) of the companion cutter B, which movement may be accomplished by any known or suitable mechanism. Ordinarily, the companion cutter B, will be stationary and secured to some portion of the machine as is common in sewing and other machinery.

Having thus described my invention, what I claim as new and desire to secure by Let-- ters Patent, is

1. A reversible trimmin cutter formed with two flanges at an ang e to each other, each end of said cutter being made in a single plane including both the said flanges one of which forms a guiding finger and the other provides a cutting edge, each end face of said cutter being at an angle to the longitudinal axis of the cutter and also at such an angle to each other that the cutters may be reversed endwise and also partially rotated upon its major axis to bring the two end faces in turn into the same plane, substantially as described.

2. A trimming cutter formed by two wings or flanges each with its inner and outer faces at an angle to each other and the end face of both wings or flanges ground in asingle plane, whereby each flange will form either a cutter or a guide for the other.

3. A trimming cutter formed by two wings or flanges each with its inner and outer faces at an angle to each other and the end face of both wings or flanges ground in a single plane inclined to the major axis of the cutter.

4. A reversible trimming cutter formed by two wings or flanges each with its inner and outer faces at an angle to each other, the end face of both wings or flan es being ground in a single plane at each enc l of the cutter, the planes of the faces at opposite ends of the cutter being inclined with respect to each other and with respect to the major axis of the cutter.

5. A reversible trimming cutter, such as described, provided with guideways one adjacent to each cutting edge to suitably locate the cutter and to facilitate its accurate, adjustment, substantially as described.

6. A reversible trimming cutter provided with a guideway on each of its two faces, substantially as described.

7. A reversible trimming cutter, formed with two flanges at an angle to each other, the inner or narrower faces of said flanges being at an obtuse angle with each other, both the flanges being cut across their ends in a single plane oblique to the plane of the face of one of the flanges at one end and oblique to the face of the other flange at the opposite end, forming an acute cutting edge at each end of the cutter, substantially as described.

8. A trimming, cutter formed with two flanges with two of their sides or faces substantially at a right angle to each other, the other two sides or faces of said flanges being at an obtuse angle to each other, the said flanges being substantially identical in cross section, substantially as described.

JOSEPH M. MERROW. 

